634625729956 has 27 divisors (see below), whose sum is σ = 1124371196011. Its totient is φ = 313424494424.

The previous prime is 634625729923. The next prime is 634625729987. The reversal of 634625729956 is 659927526436.

The square root of 634625729956 is 796634.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 132238845 + ... + 132243643.

Almost surely, 2^634625729956 is an apocalyptic number.

634625729956 is the 796634-th square number.

It is an amenable number.

634625729956 is a deficient number, since it is larger than the sum of its proper divisors (489745466055).

634625729956 is an frugal number, since it uses more digits than its factorization.

634625729956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9768 (or 4884 counting only the distinct ones).

The product of its digits is 146966400, while the sum is 64.

Multiplying 634625729956 by its sum of digits (64), we get a square (40616046717184 = 6373072²).

The spelling of 634625729956 in words is "six hundred thirty-four billion, six hundred twenty-five million, seven hundred twenty-nine thousand, nine hundred fifty-six".